Enhanced atmospheric oxidation capacity and associated ozone increases during COVID-19 lockdown in the Yangtze River Delta.

As fine particulate matter (PM 2.5 ) concentration is decreasing due to strict control measures ( Geng et al., 2019 ; Zhang et al., 2018 ), ozone (O 3 ) concentration has an increasing trend ( Chen et al., 2019 ; Wang et al., 2018 ), especially in populated and economically vibrant regions such as the Yangtze River Delta (YRD) ( Ding et al., 2013 ; Shao et al., 2016 ; Xu et al., 2017 ).

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